[HELP] Disable Nvidia Optimus in Acer Aspire M3-581TG

Hi!
I need the bios unlocked of Acer Aspire Timeline M3-581TG for disable Nvidia Optimus and use always the discrete graphics (GT640m) I'm new to this foro someone help me?

Thanks in advance!

Manufacturer and Model: Acer Aspire M3-581TG
Bios Revision : 1.02
Bios Type : InsydeH20 Rev 3.7
Bios Link : http://global-download.acer.com/GDFiles/...ER&SC=PA_7